The Wait-Until-Event pattern Has it happened  Yes, it happened!

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Presentation transcript:

The Wait-Until-Event pattern Has it happened  Yes, it happened!

The Definite Loop pattern for k in range(...):... Determines how many times the loop iterates The body of the loop window = zg.GraphWin('Animation', 650, 430) x = 20 y = 50 radius = 5 for k in range(150): circle = zg.Circle(zg.Point(x, y), radius) circle.setFill('purple') circle.draw(window) x = x + 2 y = y + 1 radius = radius + k / 100 time.sleep(0.01)

The Definite Loop pattern for k in range(...):... window = zg.GraphWin('Animation', 650, 430) x = 20 y = 50 radius = 5 for k in range(150): circle = zg.Circle(zg.Point(x, y), radius) circle.setFill('purple') circle.draw(window) x = x + 2 y = y + 1 radius = radius + k / 100 time.sleep(0.01)

The Definite Loop pattern Run n times:... The Wait-Until-Event pattern Repeatedly:... Has the event occurred? If so, break out of the loop....

The Wait-Until-Event pattern Repeatedly:... Has the event of interest occurred? If so, break out of the loop.... Repeatedly: x = something input from the user if x is the “ sentinel ” value: break out of the loop Process x. Robot: Start moving. Repeatedly: Robot: Have you bumped into anything? If so, break out of the loop. Robot: Stop

The Wait-Until-Event pattern Expressed in Python using while True and break while True:... if the event of interest occurred: break... while True: msg = 'Enter int, or -1 to stop' x = int(input(msg)) if x == -1: break Process x. robot.go(..., 0) while True: sensor = 'BUMPS_AND_WHEEL_DROPS' bump = robot.getSensor(sensor) if bump[3] == 1 or bump[4] == 1: break robot.stop()

The Definite Loop pattern for k in range(...):... The Wait-Until-Event pattern while True:... if the event of interest occurred: break... Do the following 150 times: Draw a circle. Move and grow the circle. Repeatedly draw, move and grow a circle, stopping when the circle grows beyond the border of the window. Do blah until the user asks you to stop. Robot, go until you hit a wall. Robot, go until your sensors say that you have gone 10 centimeters.

Repeatedly draw, move and grow a circle, stopping when the circle grows beyond the border of the window. Do blah until the user asks you to stop. Robot, go until you hit a wall. Robot, go until your sensors say that you have gone 10 centimeters. The Wait-Until-Event pattern while True:... if the event of interest occurred: break...